Table of Contents August 1993

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Discover Magazine's mission is to enable readers to lead richer lives by explaining and expanding their universe.  Each month we bring you in depth information and analysis from various topics ranging from technology and space to the living world we live in.
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FEATURES

As hurricanes and tornadoes, vortices are best avoided; but for many organisms they're richly rewarding.
Tens of millions of years ago the residents of Carribean forest were trapped in glowing ribbons of resin. Today they're telling scientists what their world was like.
What the world needs now, more than ever, is a good AIDS vaccine. Why don't we have one?
Why are French hemophiliacs dying of AIDS? Because French officials knowingly gave them tainted blood.

DATA

Mysterious burst of gamma rays reach Earth almost every day—where do they come from?
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